Specialization of basal surface 1) Basement membrane(基膜) 2) Plasma membrane infolding(质膜内褶) (basal longitudinal striation) 3) Hemidesmosome(半桥粒) 2828 1) Basement membrane (基膜) 2) Plasma membrane infolding (质膜内褶) (basal longitudinal striation) 3) Hemidesmosome (半桥粒) Specialization of basal surface